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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | 8x 11x 1x 10x 13x 1x 9x 8x 14x 1x 13x 13x 13x 2x 11x 11x 8x | import { UseCase } from '.';
import { Middleware, Context } from './interfaces';
export function composeMiddlewares(middlewares: Middleware[]) {
if (!Array.isArray(middlewares)) {
throw new TypeError('Middleware stack must be an array!');
}
for (const fn of middlewares) {
if (typeof fn !== 'function') {
throw new TypeError('Middleware must be composed of functions!');
}
}
return async function runStack<D, A extends UseCase, R>(
context: Context<D, A, R>,
): Promise<unknown> {
let index = -1;
async function next(i: number): Promise<unknown> {
if (i <= index) {
throw new Error('next() called multiple times');
}
index = i;
let currentMiddleware = middlewares[i];
if (i === middlewares.length) {
return Promise.resolve();
}
const nextMiddlewareNext = next.bind(null, i + 1);
return await currentMiddleware(context, nextMiddlewareNext);
}
return await next(0);
};
}
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